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https://hdl.handle.net/1822/7744
Título: | Carboxymethylcellulose obtained by ethanol/water organosolv process under acid conditions |
Autor(es): | Ruzene, Denise S. Gonçalves, A. R. Teixeira, J. A. Amorim, M. T. Pessoa de |
Palavras-chave: | Acid and alkaline catalyzed ethanol pulping Carboxymethylcellulose Chemical bleaching Infrared spectra Sugarcane bagasse Organosolv pulping |
Data: | Abr-2007 |
Editora: | Humana Press |
Revista: | Applied Biochemistry and Biotechnology |
Citação: | "Applied Biochemistry and Biotechnology". ISSN 0273-2289. 137-140:1-12 (Apr. 2007) 573-582. |
Resumo(s): | Sugar cane bagasse pulps were obtained by ethanol/water organosolv process under acid and alkaline conditions. The best condition of acid pulping for the sugarcane bagasse was 0.02 mol/L sulfuric acid at 160°C, for 1 h, whereas the best condition for alkaline pulping was 5% sodium hydroxide (base pulp) at 160°C, for 3 h. For the residual lignin removal, the acid and alkaline pulps were submitted to a chemical bleaching using sodium chlorite. Pulps under acid and alkaline conditions bleached with sodium chlorite presented viscosities of 3.6 and 7.8 mPa·s, respectively, and μ-kappa numbers of 1.1 and 2.4, respectively. The pulp under acid condition, bleached with sodium chlorite was used to obtain carboxymethylcellulose (CMC). CMC yield was 35% (pulp based), showing mass gain after the carboxymethylation reaction corresponding to 23.6% of substitution or 0.70 groups −CH2 COONa per unit of glucose residue. The infrared spectra showed the CMC characteristic bands and by the infrared technique it was possible to obtain a substitution degree (0.63), similar to the substitution degree calculated by mass gain (0.70). |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/7744 |
DOI: | 10.1007/s12010-007-9080-0 |
ISSN: | 0273-2289 1559-0291 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Ruzene_ABB.pdf | 563,12 kB | Adobe PDF | Ver/Abrir |